start a new ruby layer to do the to_vool conversion

the "normalization" is getting more and more complicated and is not tested
And it seems i really don't like working with the untyped ast

lib/ruby/block_statement.rb

@@ -0,0 +1,17 @@
+module Vool
+
+  class BlockStatement < Statement
+    attr_reader :args , :body , :clazz
+
+    def initialize( args , body , something_really_else)
+      @args , @body = args , body
+      raise "no bod" unless @body
+      @clazz = clazz
+    end
+
+    def normalize
+      BlockStatement.new( @args , @body.normalize)
+    end
+
+  end
+end